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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200501-23] Exim: Two buffer overflows

Vulnerability Assessment Details

[GLSA-200501-23] Exim: Two buffer overflows

Vulnerability Assessment Summary
Exim: Two buffer overflows

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200501-23
(Exim: Two buffer overflows)

Buffer overflows have been found in the host_aton() function
(CVE-2005-0021) as well as in the spa_base64_to_bits() function
(CVE-2005-0022), which is part of the SPA authentication code.

Impact

A local attacker could trigger the buffer overflow in host_aton()
by supplying an illegal IPv6 address with more than 8 components, using
a command line option. The second vulnerability could be remotely
exploited during SPA authentication, if it is enabled on the server.
Both buffer overflows can potentially lead to the execution of
arbitrary code.

Workaround

There is no known workaround at this time.

References:
http://www.exim.org/mail-archives/exim-announce/2005/msg00000.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0021
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0022

Solution:
All Exim users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=mail-mta/exim-4.43-r2"

Network Security Threat Level: High

Networks Security ID:

Vulnerability Assessment Copyright: (C) 2005 Michel Arboi

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